Stator construction for dynamo-electric machines



A P. wooo QTATOR CONSTRUCTION FOR DYNAMO ELECTRIC MACHINES May 8, 1928.

Filed Feb. 19, 1927 Fig. I.

Invenl'or Alexander Elwood,- fl Hi5 ATTorne gp I Patented May s, 1928.

UNITED-STATES annxaimnn r.

PATENT OFFICE.

W001 OI SGHENECTAJJY, YORK, LSSIGNOR '10 GENERAL ELEC- TRIC COMPANY, A CORPORATION OF NEW YORK? STATOR CONSTRUCTION FOB DYNAMO-ELECTRIC .MAGHDTES.

Application filed February 19, 1927. Serial No. 169,611.

My invention relates to dynamo-electric machines, particularly to the stators thereof, and has for its object the simplification of the structure of the stators thereof.

In building stators for dynamo-electric .ma'chines it has been usual to provide a main frame in whichtoothed stator laminations were retained by clamping covers having end fingers for stifiening the stator teeth formed by the laminations. The frames of these machines have been'provided with accurately.

machined surfaces in slots or on bars secured thereto and the stator laminations have been provided with projections or notches to conform to these surfaces against which they were stacked to align them in the stator soas to give the desired clearance to the rotor when the machine was completed It is the purpose of my invention to mini-' mize the number of parts of the stator by employing frame plates to clamp bars which engagepthesides of the stator teeth to stifien them so as to render the use of clamping covers unnecessary. V

- My invention will be more fully set forth in the following description taken in 0011- 1 nection withthe-accompanying drawing, in

which Figfl is a perspective view showing part of a'structure of a dynamo-electric machine including t-lii l aminationsas they are 7 arranged around aform in building the same; Fig. 2 is a perspective yiew of the stator as it appears after the arts thereof are clamped together and the orm used in its construction has been removed therefrom;

Fig. 3 is a perspective view of the complete stator, and Fig. 4: is a side elevation of the structure shown in Fig. 3. I

Referringto the drawing, my improved stator includes the usual toothed lamination sectors 1 which are overlapped as shown in Fig. 1 to constitute a toothed annular body 2 having a substantially cylindrical toothed inner periphery. In accordance with myinvention bars 3 are radially arranged engaging each side of the teeth of the annular body and extending substantially the entire length thereof and radially beyond the body.

.The annular body and the bars are clamped together between frame plates 4 by nuts 5 on the bolts 5 extending through the plates radially beyond the laminations. The frame plates are clamped against the bars 3 with suflicient .force to form a unitary structure of the plates bars and the annular body by friction therebetween in which the bars serve as end fingers to stiffen the teeth of the annular body. The frame plates have large central openings 6 therein to give the necessary clearance for the end connections of the stator winding in the completed machine and engage the bars 3 adjacent the base of the teeth of the annular body. Since the sides only of the frame plates engage the laminations and support them by friction accurate machining of the frame plates or centering of the bolt holes thereinis not required because the laminations are not centered by. contactwith any portion thereof.

The rigidity of the stator is-increased and its appearance made somewhat more finished by the use of webs 7 and 8 welded at 9 and 10 to the outer edges of plates 4. The com-' plete'stator, as shown in Fig. 3, is supported in'any convenient manner in operative relation to the rotor of a dynamo electric'machine on the pedestals 11 which in this in.- stauce are welded to the lates d.

It will be clear from t e foregoing that l have simplified the construction of stators for dynamo-electric machines. What I claim as new and desire to s eure by Letters Patent of the United States, is',-

T '1. A stator for a dynamo-electric machine comprising sector shaped toothed lamina-' vtions arranged to constitute an annular body havinga substantially cylindrical toothed inner periphery, bars on each side of saidannular body engaging the sides of said teeth, frame plates on each side of said body engaging said bars, and means including webs between said frame plates for clamp- 2 eague length ofthe teeth and radial-1y beyond the body for clamping said Plates, said bars and annular body, frame plates on each s 1de: ofsaid annular body firmly together to constibase of the teeth of said body and extending; In witness Whepeofi, 1? have hereunto set 5 radially beyond the out'erends of the annumy hand this 18th day of F'ebmary,1927.

lar body and said, bars, and means spaced from the outer peripher'y'of said annular RWQOLDF said body engaging said bars adjacentthe tute a unitary strnetme. 10; 

